How to Use Geographic and Image Roles in Tableau

TL;DR

Assign geographic roles to location fields so Tableau can correctly plot countries, cities, and postal codes in map visualizations. Assign the URL image role to string fields containing supported image links to display product pictures within views, while observing the stated URL, file extension, image count, and file size requirements.

Transcript

okay guys so the first rule that we're gonna talk about is the geographic role if you have in your data field that contains location informations or geographical areas then you can assign it to a geographical role in Tableau based on the type of the location such as City Country postal code and so on assigning this extra role can help Tableau to pl... Read More

Key Insights

• Geographic roles are extra classifications assigned to fields containing location information, such as countries, cities, and postal codes. They help Tableau understand geographic meaning and correctly position the associated data when users create map visualizations.
• A geographic role does not replace a field's basic data type. A postal code can retain its whole-number type while receiving a ZIP code or postcode role, and city or country fields can remain strings while receiving their respective geographic roles.
• Country, city, and ZIP code are presented as the most important options among Tableau's more than 12 geographic roles. Each location field should be checked because Tableau may recognize some fields automatically while leaving others with no assigned geographic role.
• Map creation works after location roles are assigned correctly. In the demonstrated worksheet, country and city fields are combined with sales, and the initial table is changed into a map through Show Me, allowing Tableau to plot the data by country.
• The image role was introduced in Tableau in 2022. It can be added to a string field whose values are URLs pointing to images, enabling those images to appear directly within visualizations instead of displaying only textual field values.
• Image URLs must begin with HTTP or HTTPS and use one of the three image extensions supported by Tableau in the lesson. These requirements determine whether Tableau can retrieve and display the referenced images in a visualization.
• Image-role fields are limited to a maximum of 500 images, and each image must be smaller than 128 kilobytes. The presenter cautions that these limits and requirements might change because the capability was completely new at the time discussed.
• Product images are identified as a useful application of the image role. The example assigns the URL role to a Product images field, combines the pictures with sales, and shows that publishing to Tableau Public resolves images that appeared broken locally.

Questions & Answers

Q: How do you assign a geographic role in Tableau?

Open the field's data type menu, locate the geographic role options, and select the role matching the field's location content, such as country, city, or ZIP code or postcode. The field keeps its original basic data type after this assignment. Once the relevant location fields have correct roles, Tableau can interpret them for map visualizations.

Q: Why should geographic roles be assigned to location fields?

Geographic roles tell Tableau what kind of location information a field contains. This additional meaning helps the application plot values correctly when building map visualizations. Without the appropriate role, a field such as postal code may remain unrecognized geographically even though its values are valid numbers, preventing Tableau from using it properly as location information.

Q: Does a Tableau geographic role replace the basic data type?

A geographic role does not remove or replace the field's basic data type. It is an additional role layered on top of that type. For example, a postal code can remain a whole number while also being classified as a ZIP code or postcode. City and country fields remain strings while receiving their matching geographic classifications.

Q: How can you create a map from geographic fields in Tableau?

First confirm that fields such as country, city, and postal code have the correct geographic roles. In a worksheet, add the desired location fields and a metric such as sales. The initial result may appear as a table. Open Show Me and select the map option, after which Tableau plots the geographically classified data on a map.

Q: What is the image role in Tableau used for?

The image role allows Tableau to display images referenced by URLs stored in a data field. The underlying field uses the string data type because each URL is a sequence of characters. Assigning the URL image role adds image meaning to that string, allowing product pictures or other referenced images to appear directly within a visualization.

Q: What requirements must Tableau image URLs meet?

The image URL must begin with HTTP or HTTPS and use one of the three image extensions supported by Tableau in the lesson. The field can contain a maximum of 500 images, and each individual image must be smaller than 128 kilobytes. The presenter notes that these conditions could change because the image role was completely new.

Q: How do you display product images with sales in Tableau?

Use a product table containing a field of URLs that point to product images. Confirm that the field has the string data type, then assign it the URL image role. Drag the image field into a worksheet and add sales as the metric. Tableau then presents the product pictures together with their associated sales values in the view.

Q: Why might image-role pictures appear broken in Tableau Public Desktop?

In the demonstration, two product images appeared broken while the view was being built in the Tableau Public desktop version. After the worksheet was published to Tableau Public on the web, all icons displayed correctly. The presenter interprets the local behavior as a possible bug in that Tableau Public version rather than a problem with the published visualization.

Summary & Key Takeaways

• Geographic roles add location meaning to fields while preserving their basic data types. Country, city, and postal code fields can be assigned matching roles, allowing Tableau to recognize locations and plot them correctly. The demonstrated customer data becomes a map after its location fields are checked and sales is added as a metric.

• Image roles allow a string field containing image URLs to display pictures inside Tableau visualizations. The demonstrated Product images field is assigned the URL image role and combined with sales. This produces a product-focused view in which images replace names, creating a more visually noticeable presentation for dashboards about products and their metrics.

• Tableau supports image URLs that begin with HTTP or HTTPS and use one of the three supported image extensions described in the lesson. Each field can contain no more than 500 images, and every image must be smaller than 128 kilobytes. The presenter notes that these requirements may change over time.